建水機械密封包括壓力控制、溫度控制、流體替換(堵塞)和雜質去除系統。在建水機械密封系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)中，上述系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)并不同時包括(kuo)在(zai)內。密(mi)封(feng)(feng)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)的選擇主(zhu)(zhu)(zhu)要取決(jue)于主(zhu)(zhu)(zhu)密(mi)封(feng)(feng)件的應(ying)(ying)用(yong)(yong)范圍。例如(ru)(ru)，如(ru)(ru)果主(zhu)(zhu)(zhu)密(mi)封(feng)(feng)用(yong)(yong)于高(gao)(gao)溫(wen)液體，密(mi)封(feng)(feng)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)應(ying)(ying)確保(bao)降(jiang)低(di)主(zhu)(zhu)(zhu)密(mi)封(feng)(feng)的環(huan)境溫(wen)度，即(ji)采(cai)用(yong)(yong)溫(wen)度控(kong)制系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)。如(ru)(ru)果主(zhu)(zhu)(zhu)密(mi)封(feng)(feng)用(yong)(yong)于固體雜質(zhi)(zhi)含(han)量(liang)高(gao)(gao)的工(gong)作介(jie)質(zhi)(zhi)，密(mi)封(feng)(feng)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)應(ying)(ying)確保(bao)在(zai)主(zhu)(zhu)(zhu)密(mi)封(feng)(feng)前降(jiang)低(di)固體雜質(zhi)(zhi)含(han)量(liang)，即(ji)采(cai)用(yong)(yong)除(chu)雜系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)。在(zai)腐蝕性介(jie)質(zhi)(zhi)中，密(mi)封(feng)(feng)系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)必須確保(bao)主(zhu)(zhu)(zhu)密(mi)封(feng)(feng)降(jiang)低(di)腐蝕速率或消(xiao)除(chu)腐蝕，即(ji)使用(yong)(yong)流(liu)體而不是堵塞流(liu)體系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)；在(zai)高(gao)(gao)壓密(mi)封(feng)(feng)裝(zhuang)置中，輔助系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)應(ying)(ying)確保(bao)多(duo)級降(jiang)壓和(he)其(qi)他措施，即(ji)壓力控(kong)制系(xi)(xi)(xi)(xi)統(tong)(tong)(tong)(tong)。

　　建水機械密封的三個(ge)主要功能(neng)如下：

　　1、沖洗功能，沖洗是建水機械密封基本的功能，它直接將液體注入單面密封或雙面密封的高壓側。一般的建水機械密封應該(gai)沖洗，特(te)別是對于輕烴泵，沖洗時(shi)達到隔(ge)離介(jie)質、冷卻(que)和(he)改善潤(run)滑的(de)目的(de)。隔(ge)離介(jie)質的(de)目的(de)可(ke)以通(tong)過將與介(jie)質相容的(de)液(ye)體引(yin)入密封腔進行(xing)外(wai)部循環沖洗來實現。

　　2、除雜和過濾功能，密封流體中的微細固體粒子、污垢等雜質對建水機械密封造成的(de)危害非(fei)常嚴重，可(ke)(ke)能(neng)導致密(mi)(mi)封(feng)端面的(de)磨損(sun)，也可(ke)(ke)能(neng)堵塞(sai)寒冷密(mi)(mi)封(feng)系統的(de)管線。密(mi)(mi)封(feng)性系統軟件具有去(qu)除(chu)殘(can)渣、保持液體(ti)清潔的(de)作用。當(dang)殘(can)渣的(de)相對(dui)密(mi)(mi)度(du)小于液體(ti)媒質相對(dui)密(mi)(mi)度(du)時，能(neng)用過濾(lv)裝置去(qu)除(chu)殘(can)渣；而當(dang)殘(can)渣的(de)相對(dui)密(mi)(mi)度(du)超(chao)過液體(ti)媒質相對(dui)密(mi)(mi)度(du)時，可(ke)(ke)選用旋液分離設備或網式(shi)過濾(lv)器去(qu)除(chu)殘(can)渣。

　　3、流體替代功能，含有固體顆粒的氣相介質和液相介質的直接密封難度很大，它們溫、毒、貴、易蒸發、易結晶。借助建水機械密封可以用雙端建水機械密封代替(ti)密(mi)封介(jie)質(zhi)，將難(nan)以(yi)直接密(mi)封的介(jie)質(zhi)轉化(hua)為密(mi)封潤滑性能好、清潔(jie)的密(mi)封液體(ti)介(jie)質(zhi)。